code: def __validate_nested_sketch_result(self, sa):
      sketch = sa.summary()
      self.__validate_sketch_result(sketch, sa)
  
      # element length summary
      t = sketch.element_length_summary()
      len_sa = sa.dropna().item_length()
      self.__validate_sketch_result(t, len_sa)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ..data_structures.sarray import SArray
  import pandas
  import numpy
  import unittest
  import random
  import copy
  import os
  import math
  import array
  import time
  import itertools
  import pytest
label_desc: Use image node_id 2 for calling the SArraySketchTest obj's underlying member method code with example usage: obj.__validate_nested_sketch_result(sa) without return types